i have a n2001bf 3port.... recently discovered that the piston skirt on the exhaust side was chiped out!...it runs fine but will not hold and idle!...it idles for a couple secs and then dies,no matter how much i turn the idle screw!....will it ever idle again,with the chipped piston?.....i really liked this engine!...does any1 on here have an extra piston they can sell or p/s set?...i dont have much $